Wave-changer for radiosignaling apparatus



I a. HILL. WAVE CHANGER FOR RADIOSIGNALING APPARATUS.

APPLICATION FILED OCT. 1918 1 I I PatentedJune 29, 1920.

- ATTOR G. HILL.

WAVE CHANGER FOR RADIOSIGNALING APPARATUS.

APPLICAHON FILED OCT. 7. I9I8. Patentedjune 29,

6 SHEETS-*SHEET 2.

ATTOR G. HILL.

WAVE CHANGER'FOR RADIOSIGNALING APPARATUS.

I APPLICATION FILED OCT.7, 1918.

,I .atented J 11116 29, 1920.

6 SHEETSSHEET 3.

1 345.00? UH UJJ INVENTOR G. HILL.

WAVE CHANGER FOR RADIOSIGNALING APPARATUS. APPLICATION FILED OCT. 7, I918.

1,345,007, Patented June 29, 1920,

QGLHILL. WAV E'CHANGEB FQR RADIOSIGNALING APPARATUS.

APPLICATION FILED OCT.7,191'8.- I 1,345,007. I

- Pate tedllun 29, 1920.

6 SHEETSSHEET 5.

ATTOR G. HILL.

' WAVE CHANGER F OR RADIOSIGNALING APPARATUS.

APPLICATION FILED OCT. 7; 1918:"-

- Patented June 29, 1920.

e SHEETS-SHEET a.

T0 SOURCE OF SUPPLY ?Z2 Z E ATTORN Y A a I I A IIIIIIIII IINIIIIII UNITED STATES A NT OFFICE.

'GUY HILL, ORWASxHIN'G-TON, nis'rn ic'ror COLUMBIA.

' WAVE-CHANGER FOR- RADIOSIGNAIING nrrsnarns."

I To all whom'it may concern:

Be 7 t known. that I, GUY HiLL,-a citizen of'the United States, and a resident of Vva'shington, District of Columbia, have 1nvented certain new and useful Improve- 'ments in WVave-Changers for Radiosignaling Apparatus, of. which the .following is a specification, accompanied by drawlngs.

This invention relates to radio signaling apparatus but more particularly to wave changing devices for both transmitting apparatus and receiving apparatus for radio energy.

In. the co-pendin application of myself and -.George H. Cl f 'iandthe co-pendin Serial ark, Serial No. 25354, application of George maintenance of the pre-determined optimum or desired electrical coupling in the oscillation transformer. The primary object of the p-resent'invention is to enable the with a single transmitting system or a 5 single receiving system, and in accordance with the" prese invention I provide means for connectin ,the deslred antennae 1n the secondary 'OI antenna circuit, while at the same time making the proper adjustments for a change of wave length with maintenance of the optimum or desired electrical Further objects of the present invention areto enable the desired antennae to be connected in circuit while'simultaneously carrying out various other features of adj ustment fo'rchange of wavelength which will hereinafter appear in this specification as illustrated in the accompanying drawings,

in -which' I .45 of circuits and apparatus at a transmitting Figure 1 is a diagrammatic representation station for carrying out the invention in one of its simplest forms, showing twoantennae, for illustrative purposes.

Figs. 2, 3, 4, and 5' are diagrammatic views of modifications of the secondary cirthat these figures In? similar portions of ig. 1;

H o. 2799, wave changing Y ,"apparatiis 'has been disclosed forchanging kfrom one wave length to another with the 20' Fig. 6 is amodification ofthe primary circuits of Fig. 1, showin parallel condenser switch. Fig. 7 is a modification in which the change from one antenna to another is made switch, as in Fig. 1.'

v Specification .01Letters'Patent. Patented J 11119. 29, 19.20, i Application filed Octrberl 7, 191a. SeriaI No;

g a form of series Fig. 8 is a modification of-Fig. 7 in which.

changes in the primary. circuits for differ-5 mt antennae are effected automatically .stead of by separate adjustments of the pri;

mary switch arm.

F 1g. 9 is a ing the adaptation of the circuits to a re-, cciver instead of. a transmitter. I Fig. 10 shows a modification of-the ,cir'-. cuits of Figs. 7 or 8, for instance to include modification of Fig. 8, Sh w both transmitting and receiving panels and 'a changeover switch for the antennae, so

that the system may be used either for transmitting or receiving.

Fig. 11 shows the extension of the. system of Fig. 1 to three antennae instead of two,

it being understood that additional antennae may. be used by an extension of the same principles.

Fig. 12 is a modification of. the secondary circuits of Fig. 11 showing different connections for the loading coils, and

Fig. 13 is a modification of the primary circuits of F ig. 11 showing a form of condenser switch, which maybe usedwith two or more antennae, in this instance being shown applied to three antennae; and Fig. 14 shows the invention applied to an arc set.

In ELCCOIdiLIlCG'Wltll this invention, transmitting or receiving apparatus for radio energy may be adjusted by a single mechani cal operation of an. operating handle, so as to cha'nge from any one of a plurality of wave lengths or any one of a plurality of antennae, having different characteristics, to any other desired wave length within the range provided on the same or on one of the'jother antennae provided. All necessary adjustments of-circuits, and coupling between circuits, is automatically effected by the mechanical operationt'oTf the' handle referred to. By this means'ia' radio transmitting or receiving set is capable of being adjusted or tuned to two or more wave lengths on two or more different antennae.

The advantages of such a system, among others, arethat larger and smaller antennae may be used in the same set, and if one an- 60 automatically instead of by a separate 50 I potential from being developed in the un tenna becomes disabled or shot away in battle, or otherwise rendered useless, there are ranged in sections a, b, c and d, each section 1 plies to all the'slider clips 6 shown drawings.

' one or more antennae remaining so that communication is uninterrupted.

Referring to the draw ngs, andmore particularly to Fig. 1, which is perhaps the simplest form of the apparatus, showing, in

this instance, a transmitting set; A represents the larger antenna andB the smaller antenna of a two-antenna set, with a switch 0 for connectin either antenna to the loading coil system whichis conveniently arhaving ad'ustable slider clips e connected to contacts a b, c and d respectively, on the secondary transmitting panel E. The loading coil sections are merely shown diagram mat'ically, but they may be individual, flat, spiral coils or else portions of one continuous coil. It is to be understood that these sliders 6 maybe adjusted by means of any of the usual and convenient insulating devices pro- .Vided for such purposes on standard wave changers, so that adjustments may be made while the set is in operation, and this apin the The primary coil F and secondary coil Gr of the oscillation transformer are suitably connected in circuitfand a convenient arrangement for carrying out the invention is to provide a primary transmitting panel H and mount. a suitable insulating revoluble switch shaft J in both panels E and H, having a knob or handle K for adjusting the circults. The secondary coil F of the transformer is assumed to be movable relatively.

to the primary coil Gr for variations ofcoupling, to enable the apparatus to be initially ad'uste'd.

uitable contact studs 7, g, h, and i, on they I secondary panel E are connected as shown to slider clips 6 on secondarycoupling coil G, which in turn is connected to ground at L through ammeter M. A double switch arm N is connected to shaft'J and cooperates with the opposite series of contacts on panel E.- This switch arm J is preferably electrically connected bycormection j. to theend of the loading coil system, to. prevent high used portions of the loading coils and consequentloss of energy when'short wave lengthsare used.

On the primary panel H, contact studs hand or are shown connected to sliders e on primary coil F and as a'suitable form-of primary switch for my purposes, a conducting disk 1?. 1s mounted'on-shaft J and con-' nectedto rotate therewith. This disk is provided'with holes 0 and p, and a primary switch arm 0 is loosely mounted on shaft J and adapted to make electricalcontact with disk n. The arm 0 as shown is provided with a hole 9 adapted to register with either 1 meter wave is obtained.

one of the holes 0 and p in thedisk n, and

supplying energy to the primary circuit is to be connected to the leads 8 and t. In the simplifiedcircuits of Fig. 1 the wave length depends upon the amount of inductance in circuit in primary c'oil F, the condenser Q being assumed in this instance to be of fixed value for simplicity of explanation.

In briefly outlining -he operation set so far described, and in order to simplify the description, variation of'coupling will be referred to in termsof distance between primary and'secondary coils F and G, in-

stead of in terms of per cent;, and it will also be assumed that the primary circuit and the antennacircuit are tuned to the same .85. oft-hewave length; If so-called impact or shock excitation sets are used, it is not necessary for these circuits to be in tune, although from my personal experience I have preferred to keep the circuits in tune. Since all, circuits, coils and couplings are variable,

any necessary refinements in adjustment can readily be made.

Operation 1.Le't'i t be assumed that the set is to be tuned to'one of two desired wave lengths, 300 meters for instance, using the larger antenna A.

In Fig. 1, asshown, the primaryswitcharm 0, secondary switch arm-N, and the antenna switch arm C arev indicated in ofi position. To tune the set, antenna switch 0 is moved to connect antenna A to the loadin coil system D, and the primary switch arni is connected to disk n by inserting a suitablepin (not shown) through hole gfiin the arm, and the upper hole pin'the dis The arm and disk will then move together,-and by'revolving the handle K counter-clockwise, as the drawing is viewed, the'arm'O is brought into contact with contact is on panel H. The adjustment of the primary and secondary switching elements is such. that the secondary switch arm N will at the same time,-

be moved into contact with contacts a and f on the secondary panel E.

Slider clip a on primary coil F, corresponding to contact In, is ad'usted until a 300 he coupling distance between primary and secondary coils F and G should preferably be made as great- .as possible to obtain loose coupling, and a small amount of inductance is connected insecondary coil G by meansof slider clip 6 001T espond-ing to ct 7 on the secondary panelE.-

1 Theslidercli 1e on section a of the load-Y ing coil systemis adjusted until the maximum antenna current is obtainedin the ammeter M and the coupling-is varied b mechanical movement of secondary coil with respect to'coil F until the antenna "current is again a maximum.

If it be assumed that the coupling distance last obtained is five inches, for instance, and that the standard distance to be 'obtained'for'the two wavelengths of 300 and 600 meters on the two antennae is to be 'two inches, then the coupling distance is reduced to two inches in secondary coil Gr" by means of slider clip '6 on secondary coil Gr corresponding to contact f, and by adding inductance in section a of the loading coils by adjustment of-its slider clip e; The set will now be properly adjusted for 300 meters but the steps briefly outlined are ,to be taken as an example only.

Operation 2.To tune the smaller antenna B to the samefwave length of 300 meters.

The primary switch arm 0 is left set on contact is, so that the primary circuit will be left unchanged. The arm 0 is then discon- 'nected from disk nby' removing the cou-- pling pin and the.disk and shaft J are rotated about 15 degrees clockwise as the drawing is viewed, which also rotates the secondary switch arm N the same number of degrees clockwise bringing arm N into con tact with contact studs. 6 and g, since the angular distance between the studs'in each set is designed to be about 15 degrees. The

rotation of the disk n has brought hole 0 in the disk into registry with hole 9 in arm-- 0, and the disk and arm are then pinned together in this new position. Antenna B is connected to the loading coil system by" antenna switch C and the coupling between'primary and secondary coils F and G may be made substantially as loose -as-possible by obtaining the greatestdistance between them. More inductance is placed in secondary coil G, by means of clip 6 on coil G, corresponding to contact 9, because antenna B is smaller than antenna A, and for this reason more inductance-will also be required in the loading coil system,

which is obtained by adjusting clip e on section I) of the loading coils until maximum.

antenna current is obtainedl Y The coupling is then adjusted for mainmum radiation, and let itqbe assumed that secondary coil G is found, to be'within one f inch of primary coil F. The coupling is then increased to the standard distance of two inches by adding-inductance to section I) of theload-ing coilgrand 'b taking induc-,

tance out of secondar coil by ad ustment coupling distance found had been more than meters. The set is, now adjusted to 300 meters on both antennae.

Operation 3.To tune antenna A to another wavelength, forinstance, 600 meters. Antenna A is connected to the loading coils and primary'arm'O is coupled to disk 'n by means of coupling pin and hole 9 in the arm and hole p in the disk. The arm 0 is' then rotated clockwise, as the drawing is viewed, into contact with contact stud m on the primary panel H. which correspondingly moves the secondary switch arm N into contact with studs 0 and h on panel E.

The tuning then proceeds a'sbefore, using the slider clips 0 corresponding to contact mon the primary panel H, and corresponding to contacts 0 and h on the secondary panel E. The'turns on the secondary coilG and the amount of inductance in section '0 of the loading coils are so adjusted that the coupling distance becomes two inches between i transformer coils F and G.

Operatz'0n4.-To tune antenna B to 600 meters.

Antenna B is connected to the loading coil system and on the primary panel .11, the arm 0 isuncoupled from the disk n, the

.disk' is again rotated clockwise, as before,

Having tuned both antennae to 300 and- 600 meters, the set is ready-for use, and the operator has'only to decide which antenna the desires to use with a given wave length and adjusts the primary switch arm 0 for that antenna and given wave length. A

single movement of operatin handle K will enable the set to be connecte in tune on the chosen antenna for a. given wave length of 300 meters for instance. To change to another wave length of 600 meters, for example, it is only necessary to adjust the primany switch arm 0 as described so that it makes contact with contact stud m on the primary panel 'H. Either of the wave lengths can be obtained on the other antenna f by similar adjustments as described.

' 'This system has a further advantage. 'In case both ofthe original antennae are destroyed for any reason, as in battle, and it of clip e corresponding to contact 9. If the v qtwo inches, the'final method of adjustment would have been like that described in ,con-

=nection with the tuning of antenna A to 300 v is desired to send on- 600 meters, for instance, on an antenna of unknown characteristics, the following is the procedure; the primary arm 0 is set on contact m to ive 600 meters in the primary circuit, an is then entirely unlocked from the disk 11. and

shaft J. Hlandle K and with it shaft J are rtated so that secondary arm N connects with one after the other of the loading coils sections a, b, 'c, and On one of these sections some current will be observed, and.

assumethat it occurs when arm N is on contac t c. The slidei clip e on secondary coil Gr corresponding to contact 0 is adjusted until max' m current is obtained. By adjusting t e coupling for maximum without regar to any standard position, the set .will bef tune for 600 meters on the unknown /ntenna.

The description of operation for Fig. 1 serves to explain the fundamental principles of the invention- In addition various modi- 'fications of'circuits and apparatus are illusof the inductance of the last section d may be used, while all of the inductance of the other sections is used. It may occur, however, that the desired wave lengths and antennae are such that the above condition is not possible. Different conditions may be met by suitable modifications of loading coil connections and the use of condensers in the antennae.

In Fig. 2 a modification of the loadingv coil circuits of Fig. 1 is shown, adapted to be applied to Fig. 1. The remainder of the secondary circuits and the primary circuits are omitted because they are to be understood as being the same as Fig. 1, or else Fig. 1 with modified primary circuits in accordance with Fig. 6, showing a series parallel condenser switch.

In-Fig. 2 two wave lengths are to be obtained on each of two antennae A and B, which have nearly thesame characteristics as to inductance and capacity, so that approximately the same inductance is required for the same wave length on each antenna.

The loading coil system D is accordingly modifiedas shown with additional slider clips 6 on sectionsa and 0, so that the requiredadjustments may be made, instead of placing substantially all of the inductance in series as 1n Fig. 1. No series antenna.

condenser is shown in Fig. 2, as it should not be required.

Another modification of the loading coil circuits D 'is shown in Fig. 3 for the same purposeas that shown in'Fig. 2.

In the modification of the loadmg coil circuits D shown in Fig.4, twowave lengths are to be obtained on each of two antennae wave length on each antenna A and B is assumed to require a series or shorteningcon denser, and the same condenser C can be used for both antennae; On the loading coil system D the additional slider clip 6' on coil a is provided so that none or any desired portion of coil a may be used in series with coil b.' In Fig. 5 the connections are preferably such that none of the inductance of loading coil sections a or b is in circuit when the longer wave length *is used with coilsc and d.

As a modification of Fig. 1, means may also be provided for automatically chan ing the value of the primary condenser 6', if necessary,'for different wavelengths, and this may be done in a manner similar to that shown in the coending ap lication of myself and Geor e Clark, erial No. 25354.

Such a mo ification is'shown in Fig. 6, indicating only. so much of the complete set as is necessary to an understanding'of the capacity changing elements. Conducting arcs o and w are provided on primary panel H on the same radius and opposite contacts k and m respectively. Another conducting are m is provided onv the panel inside the first arc, and arcs m and wt areelectrically connected as shownkeither on front or back of the panel. The primary arm 0 is provided in this instance with an insulating section y intermediate its length.

The capacit is shown as two condensers Q, which may e equal or not as desired, and they are connected in circuit withthe arcs and with the disk n as shown. 'When the arm 0 is on contact is, the two condensers are in parallel and the primary capacity is equal to their sum. When'the arm 0 is on contact m the two condensers are in series .and the primary capacity is one-half Q, as-

suming that the condensers are equal.

Inthe modification of Fig. 7 means are provided for automatically changing from one ante'nnato another at the same time the primary arm 0 is set to the proper position on disk n,inst'e'ad of changing over by means of a separate hand switch 0 as shown in Fig. 1. In Fig. 7 the shaft J may be extended to another panel B as a convenient form of construction, and an antenna switch arm N connected to the shaftis adapted to sweep over contacts a 5 0 and d Contacts a and c are electrically connected to each other and to antenna A, while contacts 6 and (Z are similarly connected and also to antenna B. Arm N is connected to loading coils D by connection j. The angular distance between the contacts on antenna panel R corresponds-to the angular spacing of the contacts on secondary panel E, so that manipulation of the switch handle K in changing Wave lengths automatically connects the desired antenna to the. set. In other respects, the diagram of Fig. 7 although slightly different from Fig. 1 in form and arrangement for convenience of illustration, is similar to Fig. 1.

Fig. 8is similar to Fig. 7 except in respect to the primary panelI-I. Instead of changing fromone antenna to the other by changing the angular position of primary arm 0 on shaft'J, means are provided in g f Changing over with; a single movement of the handle K. For this pur-,

pose primary stud is provided for each antenna and for each wave length so that allnecessary changes from one wave length to another and-from one antenna to another aremade by manipulation of the handle K alone, The contact studs 70 and kare' elec... trieally connected together and to one clip 1 on antenna B, for instance, with this same I 'iuy switch,".m ay

.the""system into a"receiving set.

wave length, primary arm O 'is moved to stud is. and theptlifer elements are correspondingly moved; The modification of loading coil systems shown in Figs. 2, 3, 4,

and 5, and the modification of the primary panel for the use of a series parallel capacbe applied to the sets shown in. Figs? and 8 as desired.

F ig. j;9' shows a modificationof the primary circuits of .Fig. 8 in order to transform In such case theprim'ary coilF becomes the secondary of -the-oscillation transformer,and coil G beco'me'sthe ,primarv. Fig. 9, as applied to the remainder of the circuits inFig. 8, illustrates theielementary diagramfor a receiving set-which enables two wave lengths to'be adjusted'to two antennae. In addition' to the condensers Q; connected as shown. S represents a detector and T are head telephones'in parallel to acondenser. Byma- 'nipulating handle K the movable parts of the set connected to shaft J rotate together and maintain fixed relation... By following the same method described in connection with Fig. 1. the receiving circuits can be tuned and thei'coupling adjusted to a. standard.r.Changing from one wave length to anotheifior from one antenna to another is centric with all the panels.

accomplished by means of handle K. Any other form of detector may be used, as vacuum tubes similar to those invented by Fleming or de Forest, for instance, and the receiver circuits may be applied with the form of primary switch 0 shown in Figs. 1 and 7, or with any of the modifications shown in Figs. 2 to 6 inclusive,

In order to make a complete transmitting and receiving system, an additional switch panel V is provided having an antenna switch W cooperating with contacts 2, 3,

and 4, 5. The antennae A and B are concoil system of a complete receiving set as shown in any one of the figures modified in accordance with Fig. 9 for receiving, and

connection jion the transmitter antenna panel connects to the loading coil system ofa complete transmitting set shown in any one. of the figures or as modified. The

main antenna switch W merely connects the two or more antennae with either the receiver antenna-switch panel or the transmitter antenna switch panel. The main shaft J, forconvenience, is shown as con An extension of the transmitting or receiving system to three antennae with three wave lengths for each antenna is shown in Fig. 11. The antenna switch C connects either one of the three antennae' A, B or B to the loading coil'system D which is made up this instance of three sets of three 'eoils'each, 6, 7, 8; 9, 10, 11; and 12, 13, 14. On secondary panel E are provided three series of studs 6, 7 8 '9, 10*, 11 and 12*, 13 14*, connected to slider clips 0 on the corresponding coils of the loading coil system D Another. series of studs on the panel, 6, 7", 8"; 9 10?, 11 and 12 13", 14*, are connected to slider clips 6 on the secondary coil G as shown.

An additional hole 2? is provided in the disk n of the primary panel H and an additional contact stud m is provided on the panel. The elements of Fig. 11 for three antennae correspond to the system and arrangement of the elements in .Fig. 1 .for two antennae and the method of tuning and the operation of the three antennae systems are the same as hereinbefore described in connection withFig. 1. v

If the three antennae B and B are of nearly the same characteristics as to inductance and capacity, so that approximately the same inductance is required for the same Wave length on each antenna, the

loading coil system -D may be modified in accordancewith the changes in circuits indicated in Figs. 2 and 3.

The. modification of the loading coil system 1) shown in Fig. 12 illustrates the manner in which the loading coils and shortening condensers C and C may be connected to 'get any necessary or desired values of inductance, or capacity and inductance,

in the antenna circuit. The additional slider. clips 6' on-the'loading coils are provided so that any desired amount of the inductance of the particular coils on which they are placed may be included in circuit. For the longest wave length on antenna A, none of the loading coil sections 10 andl l' need be used, if the inductance would be too great with their use. I

The modifications shown in Figs. '6, 7 8, 9, and 10 may be applied to Fig. 11 by appropriate changesf That is to say, a system with 'three or more antennae may be provided with a series parallel capacity switch in connection with the primary panel H, as indicated for two antennae in Fig. 6; an automatic antenna switch shown on antenna panel R in Fig. 7 may bemade-to apply to three or more antennae; an automatic primary panel iswitchshown ,in Fig. 8 may be applied to three or more antennae; three ormore antennae may be used in-ajeceiving system having receiving apparatus as indicated in Fig. 9; and a combined transmittingand receiving set having three or more'antennae may be provided, using an antenna switch panel V and antenna transmitter and receiver panels as shownin 'Fig. 10, appropriate regard being had for the proper contact studs and circuits and connections provided for successively 1ncluding the desired number of antennae in circuit;

Fig. 13- is a .modifi i the pri;

mary circuits, of Fig. 11 showing means for varymg the primary capacity for each wave length, if desired. For this purpose additional studs15, 16 and 17 are added to the primary panel H and connected in .-this instance to three primary condensers Q5,

Q, and Q: The switch-arm O has an ex- V, tension adapted. to cooperate with studs 15,. 16 and 17 and connect one condenser in circuit for each wavelength. This modifica tion of a separate condenser for'each wave length may be applied to Fig. 1 and as well to all the other figures. I

Fig. 14 shows the invention applied to a transmitting system in which no coupling coils'arerequired and the transmitting wave i length depends upon the antenna circuit.

Such a system is obtained when an arcset is connected j directly in the antenna. J This.

same method-shown in Fig. 14; appliesto some forms of so-called impact sets and also to some bulb transmitters. The circuits for these transmitters are not shown in detail, as.

it is not considered necessary for bringing out the features of this invention.

In Fig. 14 the elements for an are set are arrangeddiagrammatically in connection with the two transmittin panels H and E,

the antenna switch panel the switch shaft J and operating handle K. Operationof the handle K serves to simultaneously connect the desired antenna A or B in circuit, and also the proper loading inductance, capacity and resistance for the control of the arc. In certain cases the capacity shown can be omitted if desired and also the variation of the resistance in series with the'arc.

The electrodes 18 and 19 for the are are onnected to supply mains s and t'an'd also 'to the antenna circuit as shown,.through tageous to use a condenser in .shu-nt with I the entire antenna current, that 1s, connected betweenthe antenna and the ground, and for this purpose the condensers 29,30,231 and 32 are connectedbetween the studs 20, 21, 22

and 23, and thepoint 34in the antenna irt, as shown. 7

For the best operation oiE'an arc set, the. strength'of the magnetic flux across the arc producedby the coils '35 and 3 6 shou'l d preferably befyaried for, diiferentwave lengths as by means of the resistance R included in circuit with the 'coils .35 and136and'the battery R jor other'source of excitation. Adki stable taps or slider clipsc on resistance are connected as shown to contact studs also-jmade from coil 3Q tolarc-sliaped'contact-37 on paneljE. switcharm N on panel E is provide withan insulatingsection' 38" as shown and by means 'otithe: construction described the resistance. R is varied in accordance with different ositions of arm N for different wave lengt son each antenna, whileat the same timeadjusting. the loading inductance D,

All these variations ofloading inductance,

condensers andresistance are simultaneously effected by manipulation of thehandleK.

The system of Fig. 14 may be mad'to ap-" ply when a high frequency alternatoris directly connected in the antenna by substituting an alternator for the are. I

It 111 be understood that. the antennae illustrated in the drawings are so illustrated for dia rammatic purposes only and. that any suitable form. of antenna may be used.

It will also, be understood that my invention applies to' the transmission of .signals graph, telephone, or any other method in which energy is transmitted by electrical os cillations of a frequency appropriate to radio-telegraphy (usually above ten thousand cycles per second), although'since my invention does not relates to any definite fre quency and since it is obviously not. dependent upon the use of any particular frequency, a dower frequency might be employed. The words a pluralityof wavelengths on each of a'plurality ofantenna are to be understoodto cover-cases'in which thewave-lengths used on one antenna are the same orcliiferent from the wave-lengths used onthe bther antenna. The words an inductance having a plurality of sections are intended to indicate structuresin which the coils are arranged infsections, as a, b, 0, d, in

Figs. 1 and. 5, as wellas a continuous inductance coil such as F ofFig. 13. In the latter case, each section is a portion of the coil F overiwhich a sliding contact e moves;

that is, the coil F, as shown in Fig. 13, has

three sections.

I claim and desire to obtain by Letters Patent, the following: I f

1. In radio signaling apparatus for signaling with a plurality of wave lengths on each of aplurality of antennae, the combination of a plurality of antennae adapted to be separately connected in circuit and havingvarious characteristics as to inductance and capacity, an oscillationtransformer, an inductance having a plurality of sections, switching mechanism for simultaneously maintaining a predetermined couplingand adjusting for a plurality of diff rent wave lengths on each of said antennaa ai-d switching mechanism having connections to variable "connections on said inductance sections and said variable.

connections serving to compensatefor antenna variations.

' 2. In radio signaling a'ppara'tusfor signaling with a plurality of wave lengths on each of a plurality of antennae, the combination of a plurality of antenna adapted to be se'parately connected in circuitand having various characteristics as to inductance and capacity, an oscillation transformer,an nductance having a plurality of sections, switching mechanism;fonsimultaneously maintaining a predetermined mechanical coupling distance between the primary and secondary coils of the transformer for all wave lengths on any o f said antennae and adjusting for a plurality of different Wave lengths on each of said antennaefisaid switching mechanism havinglconnections to variable connections on said-inductance sections and said variable connections serving to compensate for antenna variations. i y 3. In radio signaling-apparatus for signaling with a plurality of Wave lengths on each of a plurality of'antennae, the combination of I a plurality of antennae adapted to be sep-.

arately connected in circuit and having variouscharacteristics as to inductance and capacity', a plurality of inductance sections, a variable connection'to each section for varying the amount of such section to compensate for antenna variations in each antenna, primary and secondary coils of an oscillation transformer, means for determining the number of sections of said inductance and the portion of one coil of said transformer in circuit for each wave length on each antenna, mean for determining the portion of the other coil of saidtransformer in circuit for each wave length on each antenna, and means common to all of saidv means for actuating them in unison. I

4. In radio signaling apparatus for signal- .ing with a plurality of wave lengths on each of a plurality of antennae, the combination of a plurality of antennae adapted to be separately connected in circuit andhavingvarious characteristics as to inductance and capacity, an oscillation transformer, additional inductance in the antenna circuit, and common means capable of actuation by a slngle mechanical operation for simultaneously connecting in circuit for all of said wave lengths: the desired antenna to the antenna circuit; the necessary inductance in-one coil of the oscillation transformer, required to effect a predetermined mechanical relation between the transformercoils, which will produce the optimum or desired electrical coupling for all of said wave lengths with any of said antennae; the proper amount of inductance in the other coil of the transformer for tuning'to the desired wave length; and the required amount of additional inductance in the antenna circuit.

5. In radio signaling apparatus for signaling with a plurality of wave lengths on each of a plurality of antennae, the combination of a plurality ofantennae adapted to be separately connected in circuit and having va-.

- rious characteristics as to inductance and capacity, an oscillation transformer, additional inductance in the antenna circuit, an antenna shortening condenser, and common means capable of actuation by a single mechanical operation": for Simultaneously connecting in sired antenna to the antenna circuit; the

necessary inductance in one coil of the oscilinductance in the other coil of the-translation transformer, required to effect a pre-' determined mechanical relation between the transformer coils, which will produce the optimum or desired electrical coupling for all of said ,wave lengths with any of said an.- tennae; the proper amount of inductance in the other coil of thetransformersfor tuning to the desired wave" length; the required amount of additional'inductance in the antenna' circuit, and the antenna shortening condenseras desired.

6. In radio signaling apparatus-for signaling with a plurality-of wave lengthson each of a plurality of antennae, the combination of a plurality of antennae adaptedto be separately connected in circuit and having various characteristics as to inductance and capacity, an oscillation transformer, capacity adapted to be connected in circuit with one coil of the transformer, additional inductance in the antenna circuit, van antenna shortening condenser and common means cap'able of actuation by a-single mechanical operation; for simultaneously connecting in necessary inductance in one coil of the oscillation transformer, required'to effect a predetermined mechanical relationbetween. the a transformer coils, which will. produce the optimum. or desired electrical coupling forall of said wave lengths-with any of said antennae; the proper amount of capacityand former: for tuning" to the desired wave length; the required amount of additional i'nductancei'n .the' antenna circuit, and the antenna shortening condenser asf'desirled,

7. .In radio signaling" a' paratus for"sig-.

naling with a plurality'o wave lengths on each of a plurality of antennae, the combination of a plurality. of antennae adapted to be separately connected in circuit "andhavin various characteristics as to inductance an capacity, variable primary and secondary coils of an oscillation transformer, capacity adapted to be connected in the primary circuit of the transformer, additional induc..

tance in the form of loading coils in the antenna c1rcu1t,,an antenna shortemn condenser, and common means capable o actuof said wave lengths: the necessary inductance in the secondary of the oscillation transformer, required to effect a predetermined mechanical relation between the primary and secondary coils, which will produce the optimum or desired electrical coupling for all of said wave lengths with any of said antennae; the proper amounts of capacity and inductance for tuning the prithe required amount ofadditional -inductance in the form of loading coils in the antenna-circuit; and the antenna shortening condenser as desired.

8. In radio signaling a parat us for signaling with a plurality 0 "Wave lengths on each of a plurality of antennae, the combination of a plurality of antennae adapted to be separately connected in circuit and having various characteristics as to inductance and single mechanical operation for simultaneously connecting in circuit for allof said wave lengths; the desired antenna to they antenna circuit; and the necessary induc tance in one coil of the oscillation transformer, required to effect a predetermined mechanical relation between the transformer -.coils, which will produce the optimum or wave lengths with any of said antennae.

9, In radio'signaling apparatus for signalingwith a plurality of wave lengths on each of a plurality of antennae, the combina tion of a plurality of antennae adapted to be separately connected in circuit and having various characteristics as to inductance and capacity, variable primary and. secondary coils of an oscillation transformer, capacity adapted to be connected in the primary circuit of the transformer, additional:

inductance in the form of loading coils in the antenna clrcuit, and common means capable of actuation by'a "single mechani cal operation for simultaneously connecting in circuit for allof said wave length; the

capacity and inductance for tuning the primary circuit to the desired wave length.

10. In radio signaling apparatus for signaling with a plurality of wave lengths on a each of a plurality ofantennae, the combination of. a plurality of antennaeadapted" to be separately connected in circuit andyhav ing various characteristics as to inductance and capacity, variable primary and secondary coils of an oscillation transformer, additional inductance in the form of loading coils in-'-the antenna circuit, and common means capable of actuation why a single me chanical operation for simultaneously connecting in circuit for all of saidwave lengths: the desired antennato the second ary or antenna circuit; and the required" amount of additional inductance inv the form,

of loading coils in the antennacircuit.

11. In radio signaling apparatusforsignaling with a plurality vof wave lengths on each of a plurality of antennae, the combination of a plurality of antennae adapted to be separately connected 'in circuit and having various characteristics .as to inducof loading coils in the antenna circuit,.

and common means capable of actuation by asingle mechanical operation for sinaling with a plurality of wave lengths on 75 multaneously connecting in circuit for all to the secondary in antenna circuit}, the necessary inductance ,in the secondary of the oscillation transformer, required to effect apre-determined mechanical relation-betweenthe primary and secondary coils, which will produce the optimum or desired electrical coupling for all of said wave lengths with any of said antennae; and the proper amounts of capacity and inductance for tuning the wave length.

12. In radio signaling apparatus for sig:

naling with a plurality of wave lengths on each of a plurality of antennae, the combination of a plurality of antennae adapted mined mechanical relation between the, PII',

niary and secondary coils, which will produce the optimum or desired electrical coupling for all of said wave lengths with any of said antennae; and the proper amounts of capacity and inductance for tuning the primary circuit to the desired wave length, and the requiredamount of addie tional inductance in the -form of loading coils in ,the antenna circuit. '13. In radio signaling apparatus for signaling with a plurality of wave lengths on each .of a pluralityof antennae, the combination of a plurality of antennae adapted to be separately connected in circuit and having" various characteristics as to inductance and capacity, variable primary and secondary' coils of an oscillation transformer,

capacity adapted to be connected in the primary 'circuit of the transformer, additional inductance in the form of loading coils in the antenna, circuit, and common means capable of actuation by a single mechanical 6 6 operation for simultaneously connecting in of said, wave lengths: the desired antenna primary circuit to the desiredmeans capable of actuation by asingle me circuit forall of said wave lengths; the desired antenna to the secondary inantenna circuit; and the proper amounts of capacity and lnductance for tunlng the primary cir- "cuitto the desired wave length, and the re- 'quired amount of additional inductance in the form of loading coils-in the antenna 14. In radio signaling apparatus for sigeach of a plurality of antennae, the combination of a plurality of antennae adapted to be'separately connected in circuit and having various characteristics as to inductance and capacity, an oscillation transformer, additional inductance in the antenna circuit,

and common means capable of actuation of a single mechanical operation for simul-' taneously connecting in circuit for all of said-wave lengths; the desired antenna to the antenna circuit; the'necessary induc-, 'ta'nce iI1 one coil of the oscillation transformer, required to effect a predetermined mechanical relation between the transformer coils, which will produce the optimum or desired electricalcoupling for. all of said Wave lenghs with any of said antennae, and the requ ed amount of additional inductance in the form of loading coils in the antenna circuit. v

. 15. In radio signaling apparatus for signaling with a plurality of wave lengths on each of-a plurality of antennae, the combi-- nation of a plurality of antennae adapted to be separatelyconnected in circuit and having various characteristics as to inductance and capacity, variable primary and sec ondary coils of an oscillation transformer,

' additional inductance in the form of loading coils in the antenna circuit, an antenna shortening condenser, and common means capable of actuation by a single mechanical operation for simultaneously connecting in circuit for all of said wave lengths: the de-' sired antenna to the'secondary or antenna circuit; the required amount of additional inductance in the form of loading coils in the antenna circuit; and the antenna shortening condenser as desired.

'16; In radio signaling, apparatus for sig- 5 na-ling with a' plurality of wave lengths on 1 each; of a plurality of antennae, the combination of a plurality of antennae adapted to be separately-connected in circuit and having various'characteristics as to inductance and capacity, an inductance having a plurality of sections and switching mechanism. capable of simultaneously connecting toa desired antenna and to the proper inductance section to give the desired wave length on said antenna, such switching mechanism having connections to variable connections on said inductance sections and said variable connections serving to compensate for antenna variations.

17. In radio signaling apparatus for sig. naling with a plurality of wave lengths on each of a pluralityv of antennae havin various characteristics as to inductance an capacity, a pluralityof contacts, an oscilv lation transformer, an inductance having I a plurality of sections, .switching mechanism cooperating with said contacts for simultaneously maintainin switching. mechanism having connections to a predetermined coupling and adjusting or a. plurality of different wave lengths on each of the.an-,

tennee .for which the, set is adapted, said.

In testirnony whereof I have signed this specification in the presence of two subscribing Witnesses.- r y GUY HIIILL.

Witnesses: v

p HERBERT, G. OGDEN M. H. PAY-NE.

variable. connections on said inductance sections, said=variab1e connections serving to compensateior variations in the antennae witg which the apparatus is adapted to be. use 1 v 

